Mathematics · Year 1

Active learning ideas

Comparing Lengths and Heights

Active learning helps students move from vague ideas like 'long' or 'tall' to clear comparisons by using their bodies and real objects. Moving, touching, and arranging materials builds lasting understanding better than worksheets alone.

• National Curriculum Attainment Targets
• KS1: Mathematics - Measurement

• 15–20 min
• Pairs → Whole Class
• 3 activities

Activity 01

• Inquiry Circle
• 20 min · Small Groups

Inquiry Circle: The Great Cube Measure

Groups choose five items in the classroom and measure them using Unifix cubes. They must record their results and then order the items from shortest to longest on a large piece of sugar paper.

Analyze how we know which object is longer if they don't start at the same place?

Facilitation Tip

During The Great Cube Measure, model how to count cubes carefully and avoid overlapping them.

What to look for

Provide students with two pencils of different lengths, one slightly shorter and one significantly longer. Ask them to write one sentence comparing their lengths using the words 'longer' or 'shorter'.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 02

• Think-Pair-Share
• 15 min · Pairs

Think-Pair-Share: Body Part Units

Pairs measure the width of their desk using their handspans. They compare their results and discuss why one student might have '6 hands' while the other has '7 hands' for the same desk.

Explain why we must use the same sized unit when measuring the length of two different things?

Facilitation Tip

In Body Part Units, ask students to explain why using the same handspan matters when comparing objects.

What to look for

Place three classroom objects (e.g., a book, a crayon, a ruler) on a table, not aligned at the base. Ask students to point to the tallest object and explain how they know, encouraging them to describe the process of visual comparison.

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Activity 03

• Gallery Walk
• 15 min · Whole Class

Gallery Walk: Height Chart

Students mark their height on a long strip of paper on the wall. They then walk along the 'chart' to find someone who is 'taller than' them and someone who is 'shorter than' them, using the correct vocabulary.

Differentiate between length and height.

Facilitation Tip

During the Gallery Walk: Height Chart, remind students to stand straight and touch the wall with their heels for fair height comparisons.

What to look for

Show students two strings of different lengths that do not start at the same point. Ask: 'How can we be sure which string is longer? What do we need to do?' Guide them to discuss aligning the ends.

• Understand
• Apply
• Analyze
• Create
• Relationship Skills
• Social Awareness

A few notes on teaching this unit

Teachers should focus on alignment and touching bases when comparing objects. Use clear language like 'place the base on the line' to avoid confusion about starting points. Research shows that children learn measurement best when they physically arrange objects and see the direct relationship between units and length.

Students will confidently compare lengths and heights using precise language and fair methods. They will measure with non-standard units and explain their reasoning clearly.

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Watch Out for These Misconceptions

• During The Great Cube Measure, watch for students leaving gaps or overlapping cubes when counting.

  Demonstrate how to place cubes end-to-end without spaces, and have students practice with a small set before measuring the full object.

• During Body Part Units, some students may use different handspans for the same object, leading to inconsistent measurements.

  Ask students to trace their handspan on paper and use only that traced unit to measure, ensuring consistency within pairs.

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Methods used in this brief

• Inquiry Circle
• Think-Pair-Share
• Gallery Walk